body{
    margin: 0;
    padding: 0;

}
.box{
    margin-top: 50px;
    height: 300px;
    /* border: 1px solid blue; */
}
.box::after{
    content: "";
    display: block;
    clear: both;
}
.item{
    width: 350px;
    float: left;
    margin-left: 30px;
    position: relative;
    overflow: hidden;

}
.item img{
    width: 350px;
    height: 300px;
}
.item .item-mask{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all ease .5s;
}
.item  .item-title{
    position: absolute;
    top: -100px;
    font-size: 16px;
    margin-left: 15px;
    color: #fff;
    transition: all ease .5s;
}
.item  .item-singer{
    position: absolute;
    transform: translateX(-100%);
    top: 220px;
    font-size: 14px;
    color: #fff;
    transition: all ease .5s;

}
.item  .item-content{
    position: absolute;
    transform: translateY(30px);
    padding: 0 15px;
    font-size: 14px;
    color: #fff;
    transition: all ease .5s;
    z-index: 100;

}

.item:hover .item-mask{
    background-color: rgba(0, 0, 0, 0.5);
}
/* 注意这个动画transition 监听的是同一个属性的变化 上面是什么，这里写的改变就是什么 */
.item:hover .item-title{
    top: 190px;
}
.item:hover .item-singer{
    margin-left: 100px;
}
.item:hover .item-content{
    transform: translateY(-150%);
}